CVE-2026-50285

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.7% (53rd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Elevated
7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 7.5Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

Pomerium is an identity and context-aware access proxy. Prior to 0.32.8, decodeQueryStringV2 in pkg/hpke/url.go performs zstd decompression of attacker-controlled data without an output-memory limit when DecryptURLValues processes HPKE V2 values for Stateless.Callback in internal/authenticateflow/stateless.go. In hosted or stateless authentication deployments, an unauthenticated attacker can obtain the receiver key from /.well-known/pomerium/hpke-public-key, provide a matching attacker-controlled sender key, and send a compressed payload to /.pomerium/callback that expands before validateSenderPublicKey rejects the sender. This can allocate hundreds of megabytes per request, exhaust proxy memory, crash or degrade the process, and block access to applications protected by the deployment. Stateful deployments are not affected because the stateful callback verifies its HMAC signature before decryption and decompression. This issue is fixed in version 0.32.8.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
65
EG Risk 65/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity75% × 45%
The EG Score, 7.5 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.7%
EPSS %ILE
53rd
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 15, 2026

Last Modified

September 24, 2026

Advisory Details (3)

Auto-updated Sep 17, 2026
Patch available. Sources: github, github_commit, github_release.
GitHub release Patch Available

v0.32.8

Patch available: pomerium/pomerium v0.32.8

https://github.com/pomerium/pomerium/releases/tag/v0.32.8
GitHub commit

commit 593eb81c7e5b (pomerium/pomerium)

Fix landed in pomerium/pomerium commit 593eb81c7e5b — awaiting tagged release

https://github.com/pomerium/pomerium/commit/593eb81c7e5bdbe6071a30d330f374967869577f
GitHub advisoryMentions a patch (unverified)

Pre-Auth Memory Exhaustion via Unbounded zstd Decompression in HPKE Callback · Advisory · pomerium/pomerium · GitHub

https://github.com/pomerium/pomerium/security/advisories/GHSA-ggw3-5987-rx77

Vendor Advisories for CVE-2026-50285(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFix by version rangeDependents
github.com/pomerium/pomerium—
  • 0.32.6 up to 0.32.8: fixed in 0.32.8
—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 11× in last 7d / 31× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  3. 2026-10-12 15:43 UTCEG score recompute
  4. 2026-10-11 19:42 UTCEG score recompute
  5. 2026-10-11 16:57 UTCEG score recompute
  6. 2026-10-11 14:21 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  15. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  16. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  17. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  18. 2026-10-01 12:35 UTCEG score recompute
  19. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  20. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  21. 2026-09-28 08:40 UTCEG score recompute
  22. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  23. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  24. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  25. 2026-09-24 21:35 UTCEG score recompute
Show 10 more
  1. 2026-09-24 08:45 UTCEG score recompute
  2. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  3. 2026-09-23 03:12 UTCEG score recompute
  4. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  5. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  6. 2026-09-17 20:18 UTCEG score recompute
  7. 2026-07-30 19:00 UTCEG score recompute
  8. 2026-07-26 11:28 UTCEG score recompute
  9. 2026-07-23 03:18 UTCEG score recompute
  10. 2026-07-15 23:19 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-50285?
CVE-2026-50285 is a high-severity vulnerability; its CVE record was published on July 15, 2026. Pomerium is an identity and context-aware access proxy. Prior to 0.32.8, decodeQueryStringV2 in pkg/hpke/url.go performs zstd decompression of attacker-controlled data without an output-memory limit when DecryptURLValues processes HPKE V2 values for Stateless.Callback in…
When was the CVE record for CVE-2026-50285 published?
The CVE record for CVE-2026-50285 was published on July 15, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 24, 2026; the record at its source may have been updated since.
Is CVE-2026-50285 actively exploited?
CVE-2026-50285 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (53rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-50285?
CVE-2026-50285 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-50285?
A fix for CVE-2026-50285 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-50285 are linked in the Vendor Advisories panel on this page.

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