CVE-2026-54770

MEDIUMPre-NVD 6.16.1
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 6.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (34th 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
Trending — 3 sources updated this weekElevated
6.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (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: 0.4%CVSS: 6.1Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

WebOb provides objects for HTTP requests and responses. Prior to 1.8.11, Response._make_location_absolute() in src/webob/response.py checks a Location value for a URI scheme or leading double slash before urllib.parse.urljoin() strips leading C0 control characters and spaces. An attacker-controlled value such as a space followed by a protocol-relative or absolute URL can therefore bypass SCHEME_RE and startswith("//") checks and be normalized to an off-host redirect. Request.relative_url() and webob.exc._HTTPMove subclasses, including HTTPFound, are also affected because they use the same unsafe URL joining behavior or bypass the earlier normalization path. An unauthenticated attacker who can influence an application's redirect target can send users to an attacker-controlled host for phishing or OAuth and SSO token theft, but exploitation requires the user to follow the redirect. This issue is fixed in version 1.8.11.

CVSS v3
6.1
EG Score
6.1MEDIUMmedium confidence
EG Risk
43
EG Risk 43/100

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)
Severity61% × 45%
The EG Score, 6.1 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (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.
EPSS PROB
0.4%
EPSS %ILE
34th
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (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)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (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

August 20, 2026

Last Modified

September 18, 2026

Advisory Details (3)

Auto-updated Aug 20, 2026
Patch available. Sources: github_commit, github.
Web page

GitHub - Pylons/webob at 1.8.11 · GitHub

https://github.com/Pylons/webob/tree/1.8.11
GitHub commit

commit ff89560643fb (Pylons/webob)

Fix landed in Pylons/webob commit ff89560643fb — awaiting tagged release

https://github.com/Pylons/webob/commit/ff89560643fb252751b4db8806a283b5377f1f07
GitHub advisoryMentions a patch (unverified)

Open redirect in Location header normalization via leading C0 control / space characters -- third times a charm? · Advisory · Pylons/webob · GitHub

https://github.com/Pylons/webob/security/advisories/GHSA-6hx8-3wjj-gr8g

Vendor Advisories for CVE-2026-54770(7)

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

Patch Availability(2)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatquay/quay-rhel9:17906902982026-10-01redhat
redhatquay/quay-rhel9:17895637532026-09-21redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
python-webob1:1.8.10-1 ... 1:1.8.9-2 (8 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
python-webob1:1.8.10-0+deb13u1, 1:1.8.10-1, 1:1.8.11-1, 1:1.8.9-1, 1:1.8.9-2
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
python-webob1:1.8.10-1, 1:1.8.9-1, 1:1.8.9-2
  • every version up to 1:1.8.11-1: fixed in 1:1.8.11-1
—
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
webob0.8 ... 1.8.9 (74 versions)
  • every version up to 1.8.11: fixed in 1.8.11
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 66× 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.

Showing the most recent 99 of 108 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 100 is merged into the row it repeats. The 9 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  3. 2026-10-12 15:56 UTCEG score recompute
  4. 2026-10-11 19:39 UTCEG score recompute
  5. 2026-10-11 16:54 UTCEG score recompute
  6. 2026-10-11 14:17 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  11. 2026-10-08 06:06 UTCEG score recompute
  12. 2026-10-08 06:06 UTCVendor advisory
  13. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  14. 2026-10-07 04:47 UTCEG score recompute
  15. 2026-10-07 04:47 UTCVendor advisory
  16. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  17. 2026-10-06 03:27 UTCEG score recompute
  18. 2026-10-06 03:27 UTCVendor advisory
  19. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  20. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  21. 2026-10-04 20:52 UTCVendor advisory
  22. 2026-10-03 16:47 UTCEG score recompute
  23. 2026-10-03 16:47 UTCVendor advisory
  24. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  25. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.4% · 34th percentile
Show 74 more
  1. 2026-10-02 11:05 UTCEG score recompute
  2. 2026-10-02 11:05 UTCVendor advisory
  3. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  4. 2026-10-01 09:30 UTCEG score recompute
  5. 2026-10-01 09:30 UTCVendor advisory
  6. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  7. 2026-09-30 08:14 UTCEG score recompute
  8. 2026-09-30 08:14 UTCVendor advisory
  9. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  10. 2026-09-29 05:37 UTCEG score recompute
  11. 2026-09-29 05:37 UTCVendor advisory
  12. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  13. 2026-09-28 04:20 UTCEG score recompute
  14. 2026-09-28 04:20 UTCVendor advisory
  15. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  16. 2026-09-27 03:03 UTCEG score recompute
  17. 2026-09-27 03:03 UTCVendor advisory
  18. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  19. 2026-09-25 04:02 UTCEG score recompute
  20. 2026-09-25 04:02 UTCVendor advisory
  21. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  22. 2026-09-24 02:45 UTCEG score recompute
  23. 2026-09-24 02:45 UTCVendor advisory
  24. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  25. 2026-09-23 01:29 UTCEG score recompute
  26. 2026-09-23 01:29 UTCVendor advisory
  27. 2026-09-22 00:12 UTCEG score recompute
  28. 2026-09-22 00:12 UTCVendor advisory
  29. 2026-09-20 22:53 UTCEG score recompute
  30. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  31. 2026-09-19 21:36 UTCEG score recompute
  32. 2026-09-18 20:20 UTCEG score recompute
  33. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  34. 2026-09-18 13:30 UTCEG score recompute
  35. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  36. 2026-09-17 12:13 UTCEG score recompute
  37. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  38. 2026-09-16 10:53 UTCEG score recompute
  39. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  40. 2026-09-15 09:36 UTCEG score recompute
  41. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  42. 2026-09-14 08:19 UTCEG score recompute
  43. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  44. 2026-09-13 07:03 UTCEG score recompute
  45. 2026-09-12 05:47 UTCEG score recompute
  46. 2026-09-11 04:30 UTCEG score recompute
  47. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  48. 2026-09-09 01:57 UTCEG score recompute
  49. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  50. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  51. 2026-09-07 15:33 UTCEG score recompute
  52. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  53. 2026-09-06 11:50 UTCEG score recompute
  54. 2026-09-05 10:33 UTCEG score recompute
  55. 2026-09-04 09:16 UTCEG score recompute
  56. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  57. 2026-09-03 07:59 UTCEG score recompute
  58. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  59. 2026-09-02 06:34 UTCEG score recompute
  60. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  61. 2026-09-01 05:18 UTCEG score recompute
  62. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  63. 2026-08-31 04:02 UTCEG score recompute
  64. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  65. 2026-08-30 02:45 UTCEG score recompute
  66. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  67. 2026-08-29 01:28 UTCEG score recompute
  68. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  69. 2026-08-27 19:11 UTCEG score recompute
  70. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  71. 2026-08-26 17:53 UTCEG score recompute
  72. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  73. 2026-08-25 15:23 UTCEG score recompute
  74. 2026-08-25 15:16 UTCEG score recompute

Related CVEs(same product + same vendor + same CWE)

Same product

2 shown

Debian:12:python-webob

Frequently asked(5)

What is CVE-2026-54770?
CVE-2026-54770 is a medium-severity vulnerability; its CVE record was published on August 20, 2026. WebOb provides objects for HTTP requests and responses. Prior to 1.8.11, Response.makelocationabsolute() in src/webob/response.py checks a Location value for a URI scheme or leading double slash before urllib.parse.urljoin() strips leading C0 control characters and spaces. An attacker-controlled…
When was the CVE record for CVE-2026-54770 published?
The CVE record for CVE-2026-54770 was published on August 20, 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 18, 2026; the record at its source may have been updated since.
Is CVE-2026-54770 actively exploited?
CVE-2026-54770 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (34th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-54770?
CVE-2026-54770 has a CVSS base score of 6.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-54770?
A fix for CVE-2026-54770 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-54770 are linked in the Vendor Advisories panel on this page.

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