Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.52, 6.4.40, 7.4.12, and 8.0.12, Symfony\Component\Yaml\Parser resolved YAML collection aliases recursively, allowing a small untrusted YAML input to expand into a multi-gigabyte structure and exhaust memory. This issue is fixed in versions 5.4.52, 6.4.40, 7.4.12, and 8.0.12.
CVE-2026-45304
“—” beside the score: it is equal to NVD's CVSS score.
This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.7% (52nd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.
Also known asEUVD-2026-44358 (ENISA EUVD) · GHSA-4qpc-3hr4-r2p4 (GitHub Security Advisories)Source: ENISA EUVD
- High severity, but no confirmed exploitation yet
A fix is available — apply it.
- CVSS v3
- 7.5
- EG Score
- 7.5HIGHmedium confidence
- EG Risk
- 49EG Risk 49/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity75% × 45%Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation0.7% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.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 none (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
- 52nd
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.
- EG Severity
- 7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
- EG Likelihood
- 0.7% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-29). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.
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 none (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
May 27, 2026
Last Modified
July 15, 2026
Advisory Details (6)
Auto-updated Jul 14, 2026YAML Parser Exponential Memory Allocation via Recursive Collection-Alias Expansion ("Billion Laughs") · Advisory · symfony/symfony · GitHub
https://github.com/symfony/symfony/security/advisories/GHSA-4qpc-3hr4-r2p4v8.0.12
Patch available: symfony/symfony v8.0.12
https://github.com/symfony/symfony/releases/tag/v8.0.12v7.4.12
Patch available: symfony/symfony v7.4.12
https://github.com/symfony/symfony/releases/tag/v7.4.12v6.4.40
Patch available: symfony/symfony v6.4.40
https://github.com/symfony/symfony/releases/tag/v6.4.40v5.4.52
Patch available: symfony/symfony v5.4.52
https://github.com/symfony/symfony/releases/tag/v5.4.52commit e77391b2e4f1 (symfony/symfony)
Patch available: symfony/symfony v5.4.52 (contains commit e77391b2e4f1)
https://github.com/symfony/symfony/commit/e77391b2e4f18821198f010d573674c8ed4a970aVendor Advisories for CVE-2026-45304(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Affected Packages
(6 across 5 ecosystems)
Packagist(2)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| symfony/symfony | v8.0.0 ... v8.0.9 (12 versions) |
| — |
| symfony/yaml | v8.0.0 ... v8.0.8 (6 versions) |
| — |
Debian:11(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| symfony | 4.4.19+dfsg-2 ... 8.1.3+dfsg-1 (200 versions) |
| — |
Debian:12(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| symfony | 5.4.23+dfsg-1 ... 5.4.52+dfsg-0+deb12u1 (22 versions) |
| — |
Debian:13(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| symfony | 6.4.21+dfsg-2, 6.4.21+dfsg-2+deb13u1, 6.4.24+dfsg-1, 6.4.25+dfsg-1, 6.4.40+dfsg-0+deb13u1 |
| — |
Debian:14(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| symfony | 6.4.21+dfsg-2 ... 7.4.9+dfsg-1 (52 versions) |
| — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 9× in last 7d / 39× 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 100 of 134 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. None are among the latest 100 rows. The 34 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-30 05:37 UTCEG score recompute
- 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-25 14:26 UTCEG score recompute
- 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-23 21:42 UTCEG score recompute
- 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
- 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-10-18 03:38 UTCEG score recompute
- 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-10-17 13:42 UTCEG score recompute
- 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-10-12 16:04 UTCEG score recompute
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- 2026-10-11 19:46 UTCEG score recompute
- 2026-10-11 17:01 UTCEG score recompute
- 2026-10-11 14:26 UTCEG score recompute
- 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.7% · 50th percentile
- 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.7% · 50th percentile
- 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.7% · 50th percentile
- 2026-10-03 16:48 UTCOSV refresh
- 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.7% · 50th percentile
- 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.7% · 50th percentile
- 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.7% · 50th percentile
- 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.7% · 50th percentile
- 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.7% · 50th percentile
- 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.7% · 50th percentile
- 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.7% · 50th percentile
- 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.7% · 50th percentile
- 2026-09-14 07:32 UTCEG score recompute
- 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.7% · 50th percentile
- 2026-09-13 03:09 UTCOSV refresh
- 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.7% · 50th percentile
- 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.7% · 50th percentile
- 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.7% · 50th percentile
- 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.7% · 50th percentile
- 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.7% · 50th percentile
- 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.7% · 50th percentile
- 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.7% · 50th percentile
- 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.7% · 50th percentile
- 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.7% · 50th percentile
- 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.7% · 50th percentile
- 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.7% · 50th percentile
- 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.7% · 49th percentile
- 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.7% · 49th percentile
- 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.7% · 49th percentile
- 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.7% · 49th percentile
- 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.7% · 49th percentile
- 2026-08-25 05:09 UTCEG score recompute
- 2026-08-23 14:52 UTCEG score recompute
- 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.8% · 54th percentile
- 2026-08-21 20:28 UTCEG score recompute
- 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-20 11:12 UTCEG score recompute
- 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-16 15:12 UTCEG score recompute
- 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-16 02:43 UTCEG score recompute
- 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-14 01:23 UTCEG score recompute
- 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-12 22:16 UTCEG score recompute
- 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-12 00:27 UTCEG score recompute
- 2026-08-11 00:09 UTCEG score recompute
- 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-09 16:59 UTCEG score recompute
- 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-08 19:16 UTCEG score recompute
- 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-07 16:44 UTCEG score recompute
- 2026-08-06 18:34 UTCEG score recompute
- 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-05 20:50 UTCEG score recompute
- 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
- 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
Related CVEs(same product + same CWE)
Same product
10 shownPackagist:symfony/yaml · Debian:11:symfony
Frequently asked(5)
What is CVE-2026-45304?
When was the CVE record for CVE-2026-45304 published?
Is CVE-2026-45304 actively exploited?
What is the CVSS score of CVE-2026-45304?
How do I remediate CVE-2026-45304?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-45304
Is Your Infrastructure Affected by CVE-2026-45304?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.