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GHSA-529P-7XQ5-2RQ6

Vulnerability from github – Published: 2026-11-10 21:34 – Updated: 2026-11-10 21:34

Details

Impact summary: An application passing a caller-supplied IV of the wrong length may crash or read beyond its buffer. Because trailing IV bytes are ignored, an attacker who knows one message and tag may forge messages under a different IV.

CWE: CWE-125: Out-of-bounds Read

Description: AES-GCM-SIV copies the caller-supplied IV or nonce into its internal state using a copy whose length is taken from the expected nonce size rather than from the length the caller actually provided. When the caller passes a shorter IV, the copy reads past the end of the caller's buffer; AddressSanitizer confirms a heap out-of-bounds read reached through EVP_CipherInit_ex() into ossl_aes_gcm_siv_init(). When the caller passes a longer IV, the implementation silently discards the trailing bytes instead of rejecting the length.

The truncation breaks the binding between the IV and the computed authentication tag. An attacker who has observed a message and its tag under one IV can produce a message and tag that verify under a different IV whose first bytes match, since the surplus bytes never influence the computation. The message itself is unchanged, so this is a failure of IV commitment rather than a classic existential forgery.

Only applications that call EVP_CipherInit_ex() (or the equivalent provider cipher initialization) with an IV length other than the standard 12 bytes for AES-GCM-SIV are affected. The severity is limited because the out-of-bounds read is small and attacker-controlled only in length, and the forgery requires an unusual IV length choice by the application.

FIPS impact: no The FIPS modules are not affected by this issue, as AES-GCM-SIV is not an approved algorithm.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-95692"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-11-10T19:21:39Z",
    "severity": null
  },
  "details": "Issue summary: Setting an AES-GCM-SIV IV shorter than the expected nonce\nlength via EVP_CipherInit_ex() may trigger a heap out-of-bounds read.\nSupplying a longer IV is silently truncated instead of rejected.\n\nImpact summary: An application passing a caller-supplied IV of the wrong\nlength may crash or read beyond its buffer. Because trailing IV bytes are\nignored, an attacker who knows one message and tag may forge messages under a\ndifferent IV.\n\nCWE: CWE-125: Out-of-bounds Read\n\nDescription: AES-GCM-SIV copies the caller-supplied IV or nonce into its\ninternal state using a copy whose length is taken from the expected nonce size\nrather than from the length the caller actually provided. When the caller\npasses a shorter IV, the copy reads past the end of the caller\u0027s buffer;\nAddressSanitizer confirms a heap out-of-bounds read reached through\nEVP_CipherInit_ex() into ossl_aes_gcm_siv_init(). When the caller passes a\nlonger IV, the implementation silently discards the trailing bytes instead of\nrejecting the length.\n\nThe truncation breaks the binding between the IV and the computed\nauthentication tag. An attacker who has observed a message and its tag under\none IV can produce a message and tag that verify under a different IV whose\nfirst bytes match, since the surplus bytes never influence the computation.\nThe message itself is unchanged, so this is a failure of IV commitment rather\nthan a classic existential forgery.\n\nOnly applications that call EVP_CipherInit_ex() (or the equivalent provider\ncipher initialization) with an IV length other than the standard 12 bytes for\nAES-GCM-SIV are affected. The severity is limited because the out-of-bounds\nread is small and attacker-controlled only in length, and the forgery requires\nan unusual IV length choice by the application.\n\nFIPS impact: no\nThe FIPS modules are not affected by this issue, as AES-GCM-SIV is not an\napproved algorithm.",
  "id": "GHSA-529p-7xq5-2rq6",
  "modified": "2026-11-10T21:34:03Z",
  "published": "2026-11-10T21:34:03Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-95692"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openssl/openssl/commit/257a3427aa0ef8d9dd2ef5b3e2d1c021a221b116"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openssl/openssl/commit/510872388f5d145cf870868b3d288a23822cb776"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openssl/openssl/commit/70a47ac78b6f3be1b22fb1551bd0bfcff4f29613"
    },
    {
      "type": "WEB",
      "url": "https://openssl-library.org/news/secadv/20261110.txt"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-95692 (GCVE-0-2026-95692)

Vulnerability from cvelistv5 – Published: 2026-11-10 18:16 – Updated: 2026-11-10 18:16

Title

Out-of-Bounds Read and Incorrect IV Length Handling in AES-GCM-SIV

Summary

Issue summary: Setting an AES-GCM-SIV IV shorter than the expected nonce length via EVP_CipherInit_ex() may trigger a heap out-of-bounds read. Supplying a longer IV is silently truncated instead of rejected. Impact summary: An application passing a caller-supplied IV of the wrong length may crash or read beyond its buffer. Because trailing IV bytes are ignored, an attacker who knows one message and tag may forge messages under a different IV. CWE: CWE-125: Out-of-bounds Read Description: AES-GCM-SIV copies the caller-supplied IV or nonce into its internal state using a copy whose length is taken from the expected nonce size rather than from the length the caller actually provided. When the caller passes a shorter IV, the copy reads past the end of the caller's buffer; AddressSanitizer confirms a heap out-of-bounds read reached through EVP_CipherInit_ex() into ossl_aes_gcm_siv_init(). When the caller passes a longer IV, the implementation silently discards the trailing bytes instead of rejecting the length. The truncation breaks the binding between the IV and the computed authentication tag. An attacker who has observed a message and its tag under one IV can produce a message and tag that verify under a different IV whose first bytes match, since the surplus bytes never influence the computation. The message itself is unchanged, so this is a failure of IV commitment rather than a classic existential forgery. Only applications that call EVP_CipherInit_ex() (or the equivalent provider cipher initialization) with an IV length other than the standard 12 bytes for AES-GCM-SIV are affected. The severity is limited because the out-of-bounds read is small and attacker-controlled only in length, and the forgery requires an unusual IV length choice by the application. FIPS impact: no The FIPS modules are not affected by this issue, as AES-GCM-SIV is not an approved algorithm.

Severity

No CVSS data available.

CWE

CWE-125 - Out-of-bounds Read

Assigner

openssl CNA under the mitre root

CNA scorecard B 78/100 over 48 records in the last 180 days details

References

4 references

URL	Tags
https://openssl-library.org/news/secadv/20261110.txt	vendor-advisory
https://github.com/openssl/openssl/commit/70a47ac…	patch
https://github.com/openssl/openssl/commit/5108723…	patch
https://github.com/openssl/openssl/commit/257a342…	patch

Impacted products

1 product

Vendor	Product	Version
OpenSSL	OpenSSL	Affected: 4.1.0 , < 4.1.1 (semver) Affected: 4.0.0 , < 4.0.4 (semver) Affected: 3.5.0 , < 3.5.10 (semver)

Date Public

2026-11-10 11:00

Credits

Billy Brumley (Rochester Institute of Technology) Billy Brumley (Rochester Institute of Technology)

Show details on NVD website

JSON

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              "version": "4.0.0",
              "versionType": "semver"
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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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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