Common Weakness Enumeration
CWE-195
AllowedSigned to Unsigned Conversion Error
Abstraction: Variant · Status: Draft
The product uses a signed primitive and performs a cast to an unsigned primitive, which can produce an unexpected value if the value of the signed primitive can not be represented using an unsigned primitive.
33 vulnerabilities reference this CWE, most recent first.
CVE-2026-62959 (GCVE-0-2026-62959)
Vulnerability from cvelistv5 – Published: 2026-07-31 19:57 – Updated: 2026-07-31 23:34
VLAI
EPSS
VEX
Title
Coturn: Pre-authentication heap memory disclosure in ACME redirect (`try_acme_redirect`)
Summary
Coturn is a free open source implementation of TURN and STUN Server. From 4.5.2 through 4.14.0, when Coturn is started with --acme-redirect <URL> and exposes a plaintext-TCP listener, an unauthenticated remote client can send a single ordinary HTTP GET request and receive a 301 response whose Location header contains up to ~870 bytes of adjacent process heap memory. The leaked region is a recycled network receive buffer that is reused without being zeroed, so on a busy server it can contain data from other clients' requests (TURN credentials, OAuth tokens, relayed payloads). Root cause is a signed→unsigned conversion. This issue is fixed in version 4.15.0.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/coturn/coturn/security/advisor… | x_refsource_CONFIRM |
| https://github.com/coturn/coturn/pull/1965 | x_refsource_MISC |
| https://github.com/coturn/coturn/commit/960835886… | x_refsource_MISC |
| https://github.com/coturn/coturn/releases/tag/4.15.0 | x_refsource_MISC |
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CVE-2026-55991 (GCVE-0-2026-55991)
Vulnerability from cvelistv5 – Published: 2026-07-22 13:10 – Updated: 2026-07-22 14:03
VLAI
EPSS
VEX
Title
Remote DNS-over-QUIC (DoQ) flow-control assertion failure in libngtcp2
Summary
In NLnet Labs Unbound 1.22.0 up to and including 1.25.1, a remote unauthenticated client can trigger a libngtcp2 assertion (if compiled with assertions on) and terminate the entire Unbound process using a single DNS-over-QUIC (DoQ) connection and one normal DNS query. This is caused by an erroneous error value passed to libngtcp2. When 'ngtcp2_conn_writev_stream()' returns 'NGTCP2_ERR_STREAM_DATA_BLOCKED', Unbound continues to call 'ngtcp2_ccerr_set_application_error()' with a '-1' error value. The 'int' literal '-1' is implicitly converted to the function's 'uint64_t error_code' parameter as '0xFFFFFFFFFFFFFFFF'. The follow-on 'ngtcp2_conn_write_connection_close()' serialises that value as a QUIC variable-length integer; because '2^64-1' exceeds the 62-bit varint ceiling, 'ngtcp2_put_uvarintlen()' fails 'assert(n < 4611686018427387904ULL)' and the whole resolver process aborts. A remote, unauthenticated DoQ client can trigger this deterministically with a single QUIC connection by advertising 'initial_max_stream_data_bidi_local = 1' in its transport parameters and sending one DoQ query without ever reading the stream.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-195 - Signed to Unsigned Conversion Error
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://www.nlnetlabs.nl/downloads/unbound/CVE-20… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| NLnet Labs | Unbound |
Affected:
1.22.0 , < 1.25.2
(semver)
|
Date Public
2026-07-22 00:00
Credits
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CVE-2026-55737 (GCVE-0-2026-55737)
Vulnerability from cvelistv5 – Published: 2026-07-27 15:13 – Updated: 2026-07-28 09:55
VLAI
EPSS
VEX
Title
Heap pointer corruption via signed/unsigned mismatch in LARGE_TUPLE_EXT decoding in erts external term format decoder
Summary
Signed to Unsigned Conversion Error and Out-of-bounds Write vulnerability in Erlang OTP erts allows an attacker who can supply a crafted Erlang external term format (ETF) binary to binary_to_term/1 to corrupt the BEAM heap pointer and crash the virtual machine.
When decoding a LARGE_TUPLE_EXT term, the validation pass decoded_size() in erts/emulator/beam/external.c reads the 32-bit arity field as unsigned (get_uint32()), while the decode pass dec_term() reads the same field as a signed 32-bit integer (get_int32()) into an int. An arity wire value of 0x80000000 passes validation as 2147483648 but decodes as -2147483648, so the subsequent hp += n moves the heap allocation pointer backward. Neither pass enforces the runtime tuple-arity limit MAX_ARITYVAL. The result is an out-of-bounds heap write; in practice the VM detects an impossible heap size and aborts, denying service. The required padding is large when uncompressed but the compressed-ETF envelope shrinks it to a small payload on the wire.
This issue affects OTP from OTP 25.0 before OTP 29.0.4, OTP 28.5.0.4 and OTP 27.3.4.15, corresponding to erts from 13.0 before 17.0.4, 16.4.0.4 and 15.2.7.11.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/erlang/otp/security/advisories… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-55737.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-55737 | related |
| https://www.erlang.org/doc/system/versions.html#o… | x_version-scheme |
| https://github.com/erlang/otp/commit/c5210b42a9d3… | patch |
Impacted products
2 products
Credits
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CVE-2026-49840 (GCVE-0-2026-49840)
Vulnerability from cvelistv5 – Published: 2026-06-09 16:00 – Updated: 2026-06-09 17:00
VLAI
EPSS
VEX
Title
FreeSWITCH: Pre-authentication heap buffer overflow in libesl `Content-Length` parsing
Summary
FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.11.1, esl_recv_event() parses Content-Length with atol() and passes the result straight to malloc(len + 1) with no sign or magnitude check. A malicious or man-in-the-middle ESL peer can send a frame with a negative Content-Length to corrupt the heap of, or crash, any process linked against libesl, before the client has authenticated to that peer. This issue has been patched in version 1.11.1.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/signalwire/freeswitch/security… | x_refsource_CONFIRM |
| https://github.com/signalwire/freeswitch/releases… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| signalwire | freeswitch |
Affected:
< 1.11.1
|
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CVE-2026-41682 (GCVE-0-2026-41682)
Vulnerability from cvelistv5 – Published: 2026-05-08 22:47 – Updated: 2026-05-11 15:56
VLAI
EPSS
VEX
Title
pupnp: Port truncation via atoi() cast in parse_uri() allows SSRF port confusion
Summary
pupnp is an SDK for development of UPnP device and control point applications. Prior to version 1.18.5, pupnp is vulnerable to SRRF port confusion due to port truncation via atoi() cast in parse_uri(). This issue has been patched in version 1.18.5.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/pupnp/pupnp/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/pupnp/pupnp/commit/def5f9a2bc4… | x_refsource_MISC |
| https://github.com/pupnp/pupnp/releases/tag/relea… | x_refsource_MISC |
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CVE-2026-26981 (GCVE-0-2026-26981)
Vulnerability from cvelistv5 – Published: 2026-02-24 02:26 – Updated: 2026-02-24 20:03
VLAI
EPSS
VEX
Title
OpenEXR has heap-buffer-overflow via signed integer underflow in ImfContextInit.cpp
Summary
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. In versions 3.3.0 through 3.3.6 and 3.4.0 through 3.4.4, a heap-buffer-overflow (OOB read) occurs in the `istream_nonparallel_read` function in `ImfContextInit.cpp` when parsing a malformed EXR file through a memory-mapped `IStream`. A signed integer subtraction produces a negative value that is implicitly converted to `size_t`, resulting in a massive length being passed to `memcpy`. Versions 3.3.7 and 3.4.5 contain a patch.
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-195 - Signed to Unsigned Conversion Error
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/AcademySoftwareFoundation/open… | x_refsource_CONFIRM |
| https://github.com/AcademySoftwareFoundation/open… | x_refsource_MISC |
| https://github.com/AcademySoftwareFoundation/open… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| AcademySoftwareFoundation | openexr |
Affected:
>= 3.3.0, < 3.3.7
Affected: >= 3.4.0, < 3.4.5 |
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CVE-2025-67897 (GCVE-0-2025-67897)
Vulnerability from cvelistv5 – Published: 2025-12-14 04:35 – Updated: 2025-12-15 21:29
VLAI
EPSS
VEX
Summary
In Sequoia before 2.1.0, aes_key_unwrap panics if passed a ciphertext that is too short. A remote attacker can take advantage of this issue to crash an application by sending a victim an encrypted message with a crafted PKESK or SKESK packet.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-195 - Signed to Unsigned Conversion Error
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sequoia-pgp | sequoia |
Affected:
0 , < 2.1.0
(semver)
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CVE-2025-52566 (GCVE-0-2025-52566)
Vulnerability from cvelistv5 – Published: 2025-06-24 03:21 – Updated: 2025-06-24 21:49
VLAI
EPSS
VEX
Title
llama.cpp tokenizer signed vs. unsigned heap overflow
Summary
llama.cpp is an inference of several LLM models in C/C++. Prior to version b5721, there is a signed vs. unsigned integer overflow in llama.cpp's tokenizer implementation (llama_vocab::tokenize) (src/llama-vocab.cpp:3036) resulting in unintended behavior in tokens copying size comparison. Allowing heap-overflowing llama.cpp inferencing engine with carefully manipulated text input during tokenization process. This issue has been patched in version b5721.
Severity
8.6 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/ggml-org/llama.cpp/security/ad… | x_refsource_CONFIRM |
| https://github.com/ggml-org/llama.cpp/commit/dd6e… | x_refsource_MISC |
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CVE-2025-49847 (GCVE-0-2025-49847)
Vulnerability from cvelistv5 – Published: 2025-06-17 20:04 – Updated: 2025-06-18 13:41
VLAI
EPSS
VEX
Title
llama.cpp Vulnerable to Buffer Overflow via Malicious GGUF Model
Summary
llama.cpp is an inference of several LLM models in C/C++. Prior to version b5662, an attacker‐supplied GGUF model vocabulary can trigger a buffer overflow in llama.cpp’s vocabulary‐loading code. Specifically, the helper _try_copy in llama.cpp/src/vocab.cpp: llama_vocab::impl::token_to_piece() casts a very large size_t token length into an int32_t, causing the length check (if (length < (int32_t)size)) to be bypassed. As a result, memcpy is still called with that oversized size, letting a malicious model overwrite memory beyond the intended buffer. This can lead to arbitrary memory corruption and potential code execution. This issue has been patched in version b5662.
Severity
8.8 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
2 references
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|---|---|
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CVE-2025-30646 (GCVE-0-2025-30646)
Vulnerability from cvelistv5 – Published: 2025-04-09 19:53 – Updated: 2025-04-09 20:39
VLAI
EPSS
VEX
Title
Junos OS and Junos OS Evolved: Receipt of a malformed LLDP TLV results in l2cpd crash
Summary
A Signed to Unsigned Conversion Error vulnerability in the Layer 2 Control Protocol daemon (l2cpd) of Juniper Networks Junos OS and Juniper Networks Junos OS Evolved allows an unauthenticated adjacent attacker sending a specifically malformed LLDP TLV to cause the l2cpd process to crash and restart, causing a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.
When an LLDP telemetry subscription is active, receipt of a specifically malformed LLDP TLV causes the l2cpd process to crash and restart.
This issue affects:
Junos OS:
* All versions before 21.2R3-S9,
* from 21.4 before 21.4R3-S10,
* from 22.2 before 22.2R3-S6,
* from 22.4 before 22.4R3-S6,
* from 23.2 before 23.2R2-S3,
* from 23.4 before 23.4R2-S4,
* from 24.2 before 24.2R2;
Junos OS Evolved:
* All versions before 21.4R3-S10-EVO,
* from 22.2-EVO before 22.2R3-S6-EVO,
* from 22.4-EVO before 22.4R3-S6-EVO,
* from 23.2-EVO before 23.2R2-S3-EVO,
* from 23.4-EVO before 23.4R2-S4-EVO,
* from 24.2-EVO before 24.2R2-EVO.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-195 - Signed to Unsigned Conversion Error
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://supportportal.juniper.net/JSA96456 | vendor-advisory |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Juniper Networks | Junos OS |
Affected:
0 , < 21.2R3-S9
(semver)
Affected: 21.4 , < 21.4R3-S10 (semver) Affected: 22.2 , < 22.2R3-S6 (semver) Affected: 22.4 , < 22.4R3-S6 (semver) Affected: 23.2 , < 23.2R2-S3 (semver) Affected: 23.4 , < 23.4R2-S4 (semver) Affected: 24.2 , < 24.2R2 (semver) |
|
| Juniper Networks | Junos OS Evolved |
Affected:
0 , < 21.4R3-S10-EVO
(semver)
Affected: 22.2-EVO , < 22.2R3-S6-EVO (semver) Affected: 22.4-EVO , < 22.4R3-S6-EVO (semver) Affected: 23.2-EVO , < 23.2R2-S3-EVO (semver) Affected: 23.4-EVO , < 23.4R2-S4-EVO (semver) Affected: 24.2-EVO , < 24.2R2-EVO (semver) |
Date Public
2025-04-09 16:00
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"value": "A Signed to Unsigned Conversion Error vulnerability in the Layer 2 Control Protocol daemon (l2cpd) of Juniper Networks Junos OS and Juniper Networks Junos OS Evolved allows an unauthenticated adjacent attacker sending a specifically malformed LLDP TLV to cause the l2cpd process to crash and restart, causing a Denial of Service (DoS).\u00a0 Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.\n\nWhen an LLDP telemetry subscription is active, receipt of a specifically malformed LLDP TLV causes the l2cpd process to crash and restart.\n\n\n\nThis issue affects:\n\nJunos OS: \n\n\n * All versions before 21.2R3-S9,\u00a0\n * from 21.4 before 21.4R3-S10,\u00a0\n * from 22.2 before 22.2R3-S6,\u00a0\n * from 22.4 before 22.4R3-S6,\u00a0\n * from 23.2 before 23.2R2-S3,\u00a0\n * from 23.4 before 23.4R2-S4,\u00a0\n * from 24.2 before 24.2R2;\u00a0\n\n\n\n\nJunos OS Evolved:\u00a0\n\n\n\n * All versions before 21.4R3-S10-EVO,\n * from 22.2-EVO before 22.2R3-S6-EVO,\u00a0\n * from 22.4-EVO before 22.4R3-S6-EVO,\u00a0\n * from 23.2-EVO before 23.2R2-S3-EVO,\u00a0\n * from 23.4-EVO before 23.4R2-S4-EVO,\u00a0\n * from 24.2-EVO before 24.2R2-EVO."
}
],
"exploits": [
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"supportingMedia": [
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"value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."
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],
"value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
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"format": "CVSS",
"scenarios": [
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"lang": "en",
"value": "GENERAL"
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},
{
"cvssV4_0": {
"Automatable": "YES",
"Recovery": "AUTOMATIC",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "ADJACENT",
"baseScore": 7.1,
"baseSeverity": "HIGH",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "LOW",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "CONCENTRATED",
"vectorString": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/V:C/RE:M",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "MODERATE"
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"format": "CVSS",
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"value": "GENERAL"
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"problemTypes": [
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"descriptions": [
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"cweId": "CWE-195",
"description": "CWE-195 Signed to Unsigned Conversion Error",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-04-09T19:53:27.087Z",
"orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968",
"shortName": "juniper"
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"references": [
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"tags": [
"vendor-advisory"
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"url": "https://supportportal.juniper.net/JSA96456"
}
],
"solutions": [
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"lang": "en",
"supportingMedia": [
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"value": "The following software releases have been updated to resolve this specific issue:\u0026nbsp;\u003cbr\u003eJunos OS: 21.2R3-S9, 21.4R3-S10, 22.2R3-S6, 22.4R3-S6, 23.2R2-S3, 23.4R2-S4, 24.2R2, 24.4R1, and all subsequent releases.\u003cbr\u003eJunos OS Evolved: 21.4R3-S10-EVO, 22.2R3-S6-EVO, 22.4R3-S6-EVO, 23.2R2-S3-EVO, 23.4R2-S4-EVO, 24.2R2-EVO, 24.4R1-EVO, and all subsequent releases.\u003cbr\u003e\u003cbr\u003e"
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"value": "The following software releases have been updated to resolve this specific issue:\u00a0\nJunos OS: 21.2R3-S9, 21.4R3-S10, 22.2R3-S6, 22.4R3-S6, 23.2R2-S3, 23.4R2-S4, 24.2R2, 24.4R1, and all subsequent releases.\nJunos OS Evolved: 21.4R3-S10-EVO, 22.2R3-S6-EVO, 22.4R3-S6-EVO, 23.2R2-S3-EVO, 23.4R2-S4-EVO, 24.2R2-EVO, 24.4R1-EVO, and all subsequent releases."
}
],
"source": {
"advisory": "JSA96456",
"defect": [
"1845098"
],
"discovery": "INTERNAL"
},
"timeline": [
{
"lang": "en",
"time": "2025-04-09T16:00:00.000Z",
"value": "Initial Publication"
}
],
"title": "Junos OS and Junos OS Evolved: Receipt of a malformed LLDP TLV results in l2cpd crash",
"workarounds": [
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"lang": "en",
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"value": "There are no known workarounds for this issue."
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"value": "There are no known workarounds for this issue."
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],
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"cveMetadata": {
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"assignerShortName": "juniper",
"cveId": "CVE-2025-30646",
"datePublished": "2025-04-09T19:53:27.087Z",
"dateReserved": "2025-03-24T19:34:11.320Z",
"dateUpdated": "2025-04-09T20:39:47.342Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
No mitigation information available for this CWE.
No CAPEC attack patterns related to this CWE.