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CVE-2026-71562 (GCVE-0-2026-71562)

Vulnerability from cvelistv5 – Published: 2026-09-01 14:33 – Updated: 2026-09-01 15:53
VLAI
Title
httpc does not bound server-supplied numeric header values before integer conversion
Summary
Improper Validation of Specified Quantity in Input vulnerability in Erlang/OTP inets httpc allows a malicious or compromised HTTP server to degrade availability by returning a numeric header whose value is a very long run of digits. httpc_handler.erl converts the server-supplied Content-Length with list_to_integer/1 before comparing it against max_body_size, so the size check cannot protect the conversion, and the option defaults to nolimit in any case. The same unbounded conversion appears in httpc_response:format_response/1 for Content-Length and in httpc_response:get_ms_from_retry_after/1 for Retry-After, which is guarded only by a check that the first character is a digit. A value of up to roughly 1.26 million digits converts successfully and costs the requesting process hundreds of milliseconds of arbitrary-precision arithmetic per response. The conversion function is documented to accept integers of any size, so bounding the input is the caller's responsibility. This issue affects OTP from OTP 17.0 before OTP 27.3.4.17, from OTP 28.0 before OTP 28.5.0.6, and from OTP 29.0 before OTP 29.0.6, corresponding to inets from 5.10 before 9.3.2.7, from 9.4 before 9.6.2.3, and from 9.7 before 9.7.2. Whether OTP before OTP 17.0, corresponding to inets before 5.10, is affected is unknown.
Severity
6.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-01 15:53 UTC
CWE
  • CWE-1284 - Improper Validation of Specified Quantity in Input
Assigner
References
Impacted products
Vendor Product Version CPE status
Erlang OTP Unknown: 0 , < 17.0 (otp)
Affected: 17.0 , < 27.3.4.17 (otp)
Affected: 28.0 , < 28.5.0.6 (otp)
Affected: 29.0 , < 29.0.6 (otp)
    cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Create a notification for this product.
Erlang OTP Unknown: 0 , < 5.10 (otp)
Affected: 5.10 , < 9.3.2.7 (otp)
Affected: 9.4 , < 9.6.2.3 (otp)
Affected: 9.7 , < 9.7.2 (otp)
    cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Create a notification for this product.
Erlang OTP Affected: 84adefa331c4159d432d22840663c38f155cd4c1 , < * (git)
    cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
Eric Meadows-Jönsson Jonatan Männchen / EEF Peter Ullrich José Valim Konrad Pietrzak / Ericsson
Show details on NVD website
To clipboard 

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    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-09-02T11:46:54Z",
      "cve": "CVE-2026-71562",
      "id": "CVE-2026-71562",
      "initial_release_date": "2026-09-02T11:46:54Z",
      "product_status:known_affected": "70",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-71562",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-71562.json",
      "version": "2"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-71562\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-09-01T15:53:17.483996Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-09-01T15:53:20.563Z\"}}], \"cna\": {\"title\": \"httpc does not bound server-supplied numeric header values before integer conversion\", \"source\": {\"discovery\": \"EXTERNAL\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Eric Meadows-J\\u00f6nsson\"}, {\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Jonatan M\\u00e4nnchen / EEF\"}, {\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Peter Ullrich\"}, {\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Jos\\u00e9 Valim\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Konrad Pietrzak / Ericsson\"}], \"impacts\": [{\"capecId\": \"CAPEC-231\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-231 Oversized Serialized Data Payloads\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 6.3, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"PRESENT\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"LOW\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"cpes\": [\"cpe:2.3:a:erlang:erlang\\\\/otp:*:*:*:*:*:*:*:*\"], \"vendor\": \"Erlang\", \"modules\": [\"httpc_handler\", \"httpc_response\"], \"product\": \"OTP\", \"versions\": [{\"status\": \"unknown\", \"version\": \"0\", \"lessThan\": \"17.0\", \"versionType\": \"otp\"}, {\"status\": \"affected\", \"version\": \"17.0\", \"lessThan\": \"27.3.4.17\", \"versionType\": \"otp\"}, {\"status\": \"affected\", \"version\": \"28.0\", \"lessThan\": \"28.5.0.6\", \"versionType\": \"otp\"}, {\"status\": \"affected\", \"version\": \"29.0\", \"lessThan\": \"29.0.6\", \"versionType\": \"otp\"}], \"packageURL\": \"pkg:sid/erlang.org/otp\", \"packageName\": \"otp\", \"programFiles\": [\"lib/inets/src/http_client/httpc_handler.erl\", \"lib/inets/src/http_client/httpc_response.erl\"], \"defaultStatus\": \"unaffected\", 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Erlang/OTP inets httpc allows a malicious or compromised HTTP server to degrade availability by returning a numeric header whose value is a very long run of digits.\\n\\nhttpc_handler.erl converts the server-supplied Content-Length with list_to_integer/1 before comparing it against max_body_size, so the size check cannot protect the conversion, and the option defaults to nolimit in any case. The same unbounded conversion appears in httpc_response:format_response/1 for Content-Length and in httpc_response:get_ms_from_retry_after/1 for Retry-After, which is guarded only by a check that the first character is a digit. A value of up to roughly 1.26 million digits converts successfully and costs the requesting process hundreds of milliseconds of arbitrary-precision arithmetic per response. The conversion function is documented to accept integers of any size, so bounding the input is the caller\u0027s responsibility.\\n\\nThis issue affects OTP from OTP\\u00a017.0 before OTP\\u00a027.3.4.17, from OTP\\u00a028.0 before OTP\\u00a028.5.0.6, and from OTP\\u00a029.0 before OTP\\u00a029.0.6, corresponding to inets from 5.10 before 9.3.2.7, from 9.4 before 9.6.2.3, and from 9.7 before 9.7.2. Whether OTP before OTP\\u00a017.0, corresponding to inets before 5.10, is affected is unknown.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eImproper Validation of Specified Quantity in Input vulnerability in Erlang/OTP inets httpc allows a malicious or compromised HTTP server to degrade availability by returning a numeric header whose value is a very long run of digits.\u003c/p\u003e\\n\u003cp\u003e\u003ccode\u003ehttpc_handler.erl\u003c/code\u003e converts the server-supplied \u003ccode\u003eContent-Length\u003c/code\u003e with \u003ccode\u003elist_to_integer/1\u003c/code\u003e before comparing it against \u003ccode\u003emax_body_size\u003c/code\u003e, so the size check cannot protect the conversion, and the option defaults to \u003ccode\u003enolimit\u003c/code\u003e in any case. The same unbounded conversion appears in \u003ccode\u003ehttpc_response:format_response/1\u003c/code\u003e for \u003ccode\u003eContent-Length\u003c/code\u003e and in \u003ccode\u003ehttpc_response:get_ms_from_retry_after/1\u003c/code\u003e for \u003ccode\u003eRetry-After\u003c/code\u003e, which is guarded only by a check that the first character is a digit. A value of up to roughly 1.26 million digits converts successfully and costs the requesting process hundreds of milliseconds of arbitrary-precision arithmetic per response. The conversion function is documented to accept integers of any size, so bounding the input is the caller\u0027s responsibility.\u003c/p\u003e\\n\u003cp\u003eThis issue affects OTP from OTP\u0026nbsp;17.0 before OTP\u0026nbsp;27.3.4.17, from OTP\u0026nbsp;28.0 before OTP\u0026nbsp;28.5.0.6, and from OTP\u0026nbsp;29.0 before OTP\u0026nbsp;29.0.6, corresponding to inets from 5.10 before 9.3.2.7, from 9.4 before 9.6.2.3, and from 9.7 before 9.7.2. 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A value of up to roughly 1.26 million digits converts successfully and costs the requesting process hundreds of milliseconds of arbitrary-precision arithmetic per response. The conversion function is documented to accept integers of any size, so bounding the input is the caller\u0027s responsibility.\\n\\nThis issue affects OTP from OTP\\u00a017.0 before OTP\\u00a027.3.4.17, from OTP\\u00a028.0 before OTP\\u00a028.5.0.6, and from OTP\\u00a029.0 before OTP\\u00a029.0.6, corresponding to inets from 5.10 before 9.3.2.7, from 9.4 before 9.6.2.3, and from 9.7 before 9.7.2. Whether OTP before OTP\\u00a017.0, corresponding to inets before 5.10, is affected is unknown.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-1284\", \"description\": \"CWE-1284 Improper Validation of Specified Quantity in Input\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:erlang:erlang\\\\/otp:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"27.3.4.17\"}, {\"criteria\": \"cpe:2.3:a:erlang:erlang\\\\/otp:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"28.5.0.6\", \"versionStartIncluding\": \"28.0\"}, {\"criteria\": \"cpe:2.3:a:erlang:erlang\\\\/otp:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"29.0.6\", \"versionStartIncluding\": \"29.0\"}], \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-09-01T14:33:41.833Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-71562\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-01T15:53:23.666Z\", \"dateReserved\": \"2026-08-07T15:15:01.474Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-09-01T14:33:41.833Z\", \"assignerShortName\": \"EEF\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.