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Response snapshot Oct 29, 2026, 01:26 UTC

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VulnerabilityCVE-2026-116585

Go JOSE: Panic during CBC-HMAC processing

Decrypting a ciphertext with "A128CBC-HS256", "A192CBC-HS384", or "A256CBC-HS512" can result in a panic on untrusted input. Note this advisory is the same as https://github.com/go-jose/go-jose/security/advisories/GHSA-6mp9-8xrw-74r4.

At a glance

Exploited
Not known
Severity
6.9 Medium (CVSS 4.0)
Chance of exploitation
Not estimated
Sources
1 source

What to do

GitHub lists first patched versions: github.com/go-jose/go-jose/v4: 4.1.5. Confirm the affected range and upgrade guidance in the exact advisory.

Read GitHub-reviewed advisory GHSA-4w3g-jfj2-cw2q (opens a new tab)

What happened

Summary

Decrypting a ciphertext with "A128CBC-HS256", "A192CBC-HS384", or "A256CBC-HS512" can result in a panic on untrusted input.

Note this advisory is the same as https://github.com/go-jose/go-jose/security/advisories/GHSA-6mp9-8xrw-74r4.

Details

Continue reading

Insufficient validation of parameters can lead to attempting to index into an empty buffer. See https://github.com/go-jose/go-jose/pull/292.

Workarounds

If the application does not require the CBC-HMAC modes for content encryption, and is using github.com/go-jose/go-jose/v4, do not include them in the list of ContentEncryption algorithms passed to ParseEncrypted / ParseEncryptedJSON / ParseEncryptedCompact.

Impact

Denial of service vulnerability. Any application which decrypts untrusted ciphertexts with the indicated algorithms is affected.

Acknowledgements

Thanks to Joshua Rogers of AISLE Research for reporting this problem.

Affected package ranges reported by GitHub: github.com/go-jose/go-jose/v4: < 4.1.5 github.com/go-jose/go-jose/v3: <= 3.0.5

Scores and how they were measured

CVSS base severity

6.9

Version 4.0As of

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

Not available

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    GitHub-reviewed advisory GHSA-4w3g-jfj2-cw2q (opens a new tab)

    The public advisory supplies the description, affected package/version ranges, and any listed CVSS metric. GitHub review is not local review.

    Published Checked

  2. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-4w3g-jfj2-cw2q, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 28). Go JOSE: Panic during CBC-HMAC processing (CVE-2026-116585). https://kevwire.com/record/CVE-2026-116585

MLA

"Go JOSE: Panic during CBC-HMAC processing (CVE-2026-116585)." KEVWire, 28 Oct. 2026, kevwire.com/record/CVE-2026-116585.

Chicago

KEVWire. "Go JOSE: Panic during CBC-HMAC processing (CVE-2026-116585)." Last modified October 28, 2026. https://kevwire.com/record/CVE-2026-116585.

Evidence summary (plain text)

Go JOSE: Panic during CBC-HMAC processing (Oct 28, 2026).
Decrypting a ciphertext with "A128CBC-HS256", "A192CBC-HS384", or "A256CBC-HS512" can result in a panic on untrusted input.

Note this advisory is the same as https://github.com/go-jose/go-jose/security/advisories/GHSA-6mp9-8xrw-74r4.

Insufficient validation of parameters can lead to attempting to index into an empty buffer. See https://github.com/go-jose/go-jose/pull/292.
CVSS 6.9 (version 4.0; evidence as of Oct 28, 2026; https://github.com/advisories/GHSA-4w3g-jfj2-cw2q).
Sources:
GitHub-reviewed advisory GHSA-4w3g-jfj2-cw2q: https://github.com/advisories/GHSA-4w3g-jfj2-cw2q
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc
Record ID: CVE-2026-116585.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Oct 29, 2026, 00:55 UTC. Ingestion is not an independent editorial investigation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

Record JSON

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