CVE-2026-65627: potatosalad jose · Data Amplification
Affects potatosalad joseSource CVE Database V5
Not known to be exploited · CVSS 6.9 Medium : upgrade to 1.11.13 when convenient.
Data as of 26 Oct 2026, 20:12 UTC
- Patch
- Available – fixed in 1.11.13, 857eb8e7f2d33e2c9ca2189e77226561cacaf2ad
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 26 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade jose to 1.11.13; jose to 857eb8e7f2d33e2c9ca2189e77226561cacaf2ad.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| potatosaladjose | Affected
| Fixed in
|
| josepotatosalad/erlang-jose | Affected
| Fixed in
|
Hexjosepkg:hex/joseOther threats | Affected
| Fixed in
|
CPE configurations (1)
cpe:2.3:a:potatosalad:jose:*:*:*:*:*:*:*:*
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
Description
Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in potatosalad jose (erlang-jose) allows a remote attacker to exhaust a node's memory with a small crafted JWE token. The jose_jwe_zip:uncompress/2 function in src/jwe/jose_jwe_zip.erl decompresses the DEFLATE-compressed plaintext of a JWE that carries the optional zip: DEF header by calling zlib:inflate/2 on the entire attacker-controlled stream, with no bound on the output size or the inflation ratio. Raw DEFLATE reaches ratios around 1000:1 on highly repetitive input, so a few-kilobyte token inflates to hundreds of megabytes or gigabytes in a single call. Decompression runs automatically during decryption through jose_jwe:block_decrypt/2 (JOSE.JWE.block_decrypt/2 in Elixir), before the recipient can inspect or reject the payload. With the common asymmetric key-management algorithms (RSA-OAEP, ECDH-ES) an attacker needs only the recipient's public key to craft such a token, so no authentication or secret material is required. A single small token can exhaust the node's memory and crash the BEAM, denying service to all users. This issue affects jose: from 1.0.0 before 1.11.13.
References
- github.com/potatosalad/erlang-jose/security/advisories/GHSA-wfpv-qxp8-x5gm (opens in a new tab)
- cna.erlef.org/cves/CVE-2026-65627.html (opens in a new tab)
- osv.dev/vulnerability/EEF-CVE-2026-65627 (opens in a new tab)
- github.com/potatosalad/erlang-jose/commit/a7746ecd4950f85a393136e449a91dac62b5c429 (opens in a new tab)
- github.com/potatosalad/erlang-jose/commit/857eb8e7f2d33e2c9ca2189e77226561cacaf2ad (opens in a new tab)