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CVE-2026-13608 (GCVE-0-2026-13608)

Vulnerability from cvelistv5 – Published: 2026-09-06 17:47 – Updated: 2026-09-08 15:39
VLAI
Title
OpenLDAP SASL authentication bypass
Summary
A flaw in the libcurl SASL negotiation for LDAP authentication allows an incomplete handshake sequence to be misinterpreted as a successful cryptographic verification. An attacker executing a Man-in-the-Middle (MITM) attack can inject a premature or shortcut response that bypasses complete peer validation.
Severity
7.4 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-08 15:39 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
curl curl Affected: 8.21.0 , ≤ 8.21.0 (semver)
Affected: 8.20.0 , ≤ 8.20.0 (semver)
Affected: 8.19.0 , ≤ 8.19.0 (semver)
Affected: 8.18.0 , ≤ 8.18.0 (semver)
Affected: 8.17.0 , ≤ 8.17.0 (semver)
Affected: 8.16.0 , ≤ 8.16.0 (semver)
Affected: 8.15.0 , ≤ 8.15.0 (semver)
Affected: 8.14.1 , ≤ 8.14.1 (semver)
Affected: 8.14.0 , ≤ 8.14.0 (semver)
Affected: 8.13.0 , ≤ 8.13.0 (semver)
Affected: 8.12.1 , ≤ 8.12.1 (semver)
Affected: 8.12.0 , ≤ 8.12.0 (semver)
Affected: 8.11.1 , ≤ 8.11.1 (semver)
Affected: 8.11.0 , ≤ 8.11.0 (semver)
Affected: 8.10.1 , ≤ 8.10.1 (semver)
Affected: 8.10.0 , ≤ 8.10.0 (semver)
Affected: 8.9.1 , ≤ 8.9.1 (semver)
Affected: 8.9.0 , ≤ 8.9.0 (semver)
Affected: 8.8.0 , ≤ 8.8.0 (semver)
Affected: 8.7.1 , ≤ 8.7.1 (semver)
Affected: 8.7.0 , ≤ 8.7.0 (semver)
Affected: 8.6.0 , ≤ 8.6.0 (semver)
Affected: 8.5.0 , ≤ 8.5.0 (semver)
Affected: 8.4.0 , ≤ 8.4.0 (semver)
Affected: 8.3.0 , ≤ 8.3.0 (semver)
Affected: 8.2.1 , ≤ 8.2.1 (semver)
Affected: 8.2.0 , ≤ 8.2.0 (semver)
Affected: 8.1.2 , ≤ 8.1.2 (semver)
Affected: 8.1.1 , ≤ 8.1.1 (semver)
Affected: 8.1.0 , ≤ 8.1.0 (semver)
Affected: 8.0.1 , ≤ 8.0.1 (semver)
Affected: 8.0.0 , ≤ 8.0.0 (semver)
Affected: 7.88.1 , ≤ 7.88.1 (semver)
Affected: 7.88.0 , ≤ 7.88.0 (semver)
Affected: 7.87.0 , ≤ 7.87.0 (semver)
Affected: 7.86.0 , ≤ 7.86.0 (semver)
Affected: 7.85.0 , ≤ 7.85.0 (semver)
Affected: 7.84.0 , ≤ 7.84.0 (semver)
Affected: 7.83.1 , ≤ 7.83.1 (semver)
Affected: 7.83.0 , ≤ 7.83.0 (semver)
Affected: 7.82.0 , ≤ 7.82.0 (semver)
guessed Create a notification for this product.
Credits
Eunsoo Kim (Autonomous Code Security team at Microsoft) Eunsoo Kim
Show details on NVD website
To clipboard 

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    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.4, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-13608\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-09-08T15:39:09.395825Z\"}}}], \"references\": [{\"url\": \"https://hackerone.com/reports/3822248\", \"tags\": [\"exploit\"]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-923\", \"description\": \"CWE-923 Improper Restriction of Communication Channel to Intended Endpoints\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-09-08T15:39:40.949Z\"}}], \"cna\": {\"title\": \"OpenLDAP SASL authentication bypass\", \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Eunsoo Kim (Autonomous Code Security team at Microsoft)\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Eunsoo Kim\"}], \"affected\": [{\"vendor\": \"curl\", \"product\": \"curl\", \"versions\": [{\"status\": \"affected\", \"version\": \"8.21.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.21.0\"}, {\"status\": \"affected\", \"version\": \"8.20.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.20.0\"}, {\"status\": \"affected\", \"version\": \"8.19.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.19.0\"}, {\"status\": \"affected\", \"version\": \"8.18.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.18.0\"}, {\"status\": \"affected\", \"version\": \"8.17.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.17.0\"}, {\"status\": \"affected\", \"version\": \"8.16.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.16.0\"}, {\"status\": \"affected\", \"version\": \"8.15.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.15.0\"}, {\"status\": \"affected\", \"version\": \"8.14.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.14.1\"}, {\"status\": \"affected\", \"version\": \"8.14.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.14.0\"}, {\"status\": \"affected\", \"version\": \"8.13.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.13.0\"}, {\"status\": \"affected\", \"version\": \"8.12.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.12.1\"}, {\"status\": \"affected\", \"version\": \"8.12.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.12.0\"}, {\"status\": \"affected\", \"version\": \"8.11.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.11.1\"}, {\"status\": \"affected\", \"version\": \"8.11.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.11.0\"}, {\"status\": \"affected\", \"version\": \"8.10.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.10.1\"}, {\"status\": \"affected\", \"version\": \"8.10.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.10.0\"}, {\"status\": \"affected\", \"version\": \"8.9.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.9.1\"}, {\"status\": \"affected\", \"version\": \"8.9.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.9.0\"}, {\"status\": \"affected\", \"version\": \"8.8.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.8.0\"}, {\"status\": \"affected\", \"version\": \"8.7.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.7.1\"}, {\"status\": \"affected\", \"version\": \"8.7.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.7.0\"}, {\"status\": \"affected\", \"version\": \"8.6.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.6.0\"}, {\"status\": \"affected\", \"version\": \"8.5.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.5.0\"}, {\"status\": \"affected\", \"version\": \"8.4.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.4.0\"}, {\"status\": \"affected\", \"version\": \"8.3.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.3.0\"}, {\"status\": \"affected\", \"version\": \"8.2.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.2.1\"}, {\"status\": \"affected\", \"version\": \"8.2.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.2.0\"}, {\"status\": \"affected\", \"version\": \"8.1.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.1.2\"}, {\"status\": \"affected\", \"version\": \"8.1.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.1.1\"}, {\"status\": \"affected\", \"version\": \"8.1.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.1.0\"}, {\"status\": \"affected\", \"version\": \"8.0.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.0.1\"}, {\"status\": \"affected\", \"version\": \"8.0.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"8.0.0\"}, {\"status\": \"affected\", \"version\": \"7.88.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.88.1\"}, {\"status\": \"affected\", \"version\": \"7.88.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.88.0\"}, {\"status\": \"affected\", \"version\": \"7.87.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.87.0\"}, {\"status\": \"affected\", \"version\": \"7.86.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.86.0\"}, {\"status\": \"affected\", \"version\": \"7.85.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.85.0\"}, {\"status\": \"affected\", \"version\": \"7.84.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.84.0\"}, {\"status\": \"affected\", \"version\": \"7.83.1\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.83.1\"}, {\"status\": \"affected\", \"version\": \"7.83.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.83.0\"}, {\"status\": \"affected\", \"version\": \"7.82.0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.82.0\"}], \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://curl.se/docs/CVE-2026-13608.json\", \"name\": \"json\"}, {\"url\": \"https://curl.se/docs/CVE-2026-13608.html\", \"name\": \"www\"}, {\"url\": \"https://hackerone.com/reports/3822248\", \"name\": \"issue\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"A flaw in the libcurl SASL negotiation for LDAP authentication allows an\\nincomplete handshake sequence to be misinterpreted as a successful\\ncryptographic verification. An attacker executing a Man-in-the-Middle (MITM)\\nattack can inject a premature or shortcut response that bypasses complete peer\\nvalidation.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"description\": \"CWE-923 Improper Restriction of Communication Channel to Intended Endpoints\"}]}], \"providerMetadata\": {\"orgId\": \"2499f714-1537-4658-8207-48ae4bb9eae9\", \"shortName\": \"curl\", \"dateUpdated\": \"2026-09-06T17:47:01.951Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-13608\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-08T15:39:45.194Z\", \"dateReserved\": \"2026-06-29T08:57:44.945Z\", \"assignerOrgId\": \"2499f714-1537-4658-8207-48ae4bb9eae9\", \"datePublished\": \"2026-09-06T17:47:01.951Z\", \"assignerShortName\": \"curl\"}",
      "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.