GHSA-g7f3-828f-7h7m · Severity: medium · Ecosystem: pip — Authlib : JWE zip=DEF decompression bomb enables DoS
Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.5, Authlib’s JWE zip=DEF path performs unbounded DEFLATE decompression. A very small ciphertext can expand into tens or hundreds of megabytes on decrypt, allowing an attacker who can supply decryptable tokens to exhaust memory and CPU and cause denial of service. This issue has been patched in version 1.6.5. Workarounds for this issue involve rejecting or stripping zip=DEF for inbound JWEs at the application boundary, forking and add a bounded decompression guard via decompressobj().decompress(data, MAX_SIZE)) and returning an error when output exceeds a safe limit, or enforcing strict maximum token sizes and fail fast on oversized inputs; combine with rate limiting.
Conclusion & alert: CVE-2025-62706 is rated Exploit Available (51.6/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.12%). Core evidence: 1 public exploit reference(s) are indexed (Exploit-DB). Mandatory action: Public exploits are available—assess exposure, apply mitigations, and prioritize patching.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
| EDB-ID | Source | Kind | Published | Link |
|---|---|---|---|---|
| — | nvd_ref | exploit_tag | Exploit-DB ↗ |
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-03-20 | 0.17% | 0.12% | -0.05% |
| 2 | 2026-02-21 | 0.07% | 0.17% | +0.10% |
| 3 | 2025-11-21 | — | 0.07% | — |
Full EPSS history (4 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 6.5 | 3.1 | MEDIUM |
|
2.8 | 3.6 | [email protected] |
GHSA-g7f3-828f-7h7m · Severity: medium · Ecosystem: pip — Authlib : JWE zip=DEF decompression bomb enables DoS
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2025-62706 not yet assigned priority: Debian including 1 source packages (python-authlib), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2025-62706 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2025-62706 |
suse
|
medium | CVE-2025-62706 severity moderate: SUSE including 1 source package names (python311-Authlib-1.3.1-150600.3.9.1), 3 product×package rows across 3 product lines (SUSE Linux Enterprise Module for Python 3 15 SP6, SUSE Linux Enterprise Module for Python 3 15 SP7, openSUSE Leap 15.6): Fixed 3. | https://www.suse.com/security/cve/CVE-2025-62706/ |
ubuntu
|
medium | CVE-2025-62706 medium priority: Ubuntu including 1 source packages (python-authlib), 5 status rows across 5 suites (jammy, noble, plucky, questing, upstream): released 3, ignored 1, needed 1. | https://ubuntu.com/security/CVE-2025-62706 |
| URL | Tags |
|---|---|
| https://github.com/authlib/authlib/commit/e0863d5129316b1790eee5f14cece32a03b8184d | Patch |
| https://github.com/authlib/authlib/security/advisories/GHSA-g7f3-828f-7h7m | Exploit Mitigation Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2025/10/msg00032.html |